Jeans are everyday wear for many of us. Have you ever wondered why they have that little pocket inside the right front pocket? What's it for? The younger you are, the less likely you are to know. says Levi Strauss introduced the first "waist overalls" around 1879. We now know them as jeans. In those days, people didn't check the time by pulling their phones out of their pockets. They didn't look at their wristwatches, either. wristwatches hadn't been invented yet. People carried pocket watches. I've actually owned one. It was a gift from my grandmother.